[skifreak69]

Primer could help the paint bond better, but more important is prepping it properly. You need to make sure it is very clean and sanded lightly to roughen up the surfaces to help bond paint better. You can probably check with the paint manufactures or paint shop to see if the recommend any special primer for plastic.
I've used the duplicolor anodized paint with it's ground coat on a few things and its held up well.